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Double Photoionisation Spectra of Molecules$
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John Eland and Raimund Feifel

Print publication date: 2017

Print ISBN-13: 9780198788980

Published to Oxford Scholarship Online: March 2018

DOI: 10.1093/oso/9780198788980.001.0001

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Triatomic molecules

Triatomic molecules

(p.53) Chapter 3 Triatomic molecules
Double Photoionisation Spectra of Molecules

John H. D. Eland

Raimund Feifel

Oxford University Press

Double ionisation of the triatomic molecules presented in this chapter shows an added degree of complexity. Besides potentially having many more electrons, they have three vibrational degrees of freedom (three normal modes) instead of the single one in a diatomic molecule. For asymmetric and bent triatomic molecules multiple modes can be excited, so the spectral bands may be congested in all forms of electronic spectra, including double ionisation. Double photoionisation spectra of H2O, H2S, HCN, CO2, N2O, OCS, CS2, BrCN, ICN, HgCl2, NO2, and SO2 are presented with analysis to identify the electronic states of the doubly charged ions. The order of the molecules in this chapter is set first by the number of valence electrons, then by the molecular weight.

Keywords:   double ionisation, triatomic molecules, H2O, CO2, H2S, N2O, NO2, OCS, CS2

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